Problems: Studio Neat Cosmonaut Stylus

I bought a Studio Neat Cosmonaut several weeks ago.
And the first few weeks I was very happy with it!

But that changed after using it longer.
Now I notice the "tip" of the stylus is getting softer.
That means it's getting too soft, it seems the tip has become bigger or wider.
The stylus doesn't react well to the screen anymore.
Drawing precisely with it is almost impossible now...

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